考博考试

根据网考网考试中心的统计分析，以下试题在2019/7/18日考博习题练习中，答错率较高，为：45%
【单选题】This week marks the 10^th anniversary of theAlar apple scare, in which manyAmerican consumers were driven into a panic following the release of a report by an environmental organization claiming that apples containing the chemicalAlar posed a serious health threat to preschoolers. The report was disseminated through a PR (Problem Report) campaign and bypassed any legitimate form of scientific peer re view. Introduced to theAmerican public byCBS "60 Minutes," the unsubstantiated claims in the report led some school districts to remove apples from their school lunch programs and unduly frightened conscientious parents trying to develop good eating habits for their children.
Last month,Consumers Union released a report wanting consumers of the perils of consuming many fruits and vegetables that frequently contained "unsafe" levels of pesticide residues. This was especially true for children, they claimed, lake its predecessor 10 years earlier, theConsumers Union report received no legitimate scientific peer review and the public’s first exposure to it was through news coverage.
Not only does such reporting potentially drive children for consuming healthful fruits and vegetables, the conclusions were based on a misleading interpretation of what constitutes a "safe" level of exposure.Briefly, the authors used values known as the "chronic reference doses," set by the U.S. environmental ProtectionAgency, as their barometers of safely. Used appropriately, thee levels represent the maximum amount of pesticide that could be consumed daily for life without concern. For a 70-year lifetime, for example, consumers would have to ingest this ’average amount of pesticide every day for more than 25,000 days. It is clear, as the report points out, that there are days on which kids may be exposed to more; it is also clear that there are many more days when exposure is zero. Had the authors more appropriately calculated the cumulative exposures for which the safety standards axe meant to apply, there would have been no risks and no warnings.
Parents should feel proud, rather than guilty, of providing fruits and vegetables for their children. It is well established that a diet rich in such foods decreases the risk of heart disease and cancer. Such benefits dramatically overwhelm the theoretical risks of tiny amounts of pesticides in fooD、So keep serving up the peaches, apples, squash, grapes and pears.
The "chronic reference doses" (in boldface in Paragraph 3) refer to ______.
A、the safe levels of pesticide exposure

B、the amount of fruits one can safely eat
C、one’s digestive capacity for fruits
D、health values of fruits and vegetables
网考网参考答案：A，答错率：45%
网考网试题解析：
由Used appropriately, these levels represent the maximum amount of pesticide that could be consumed daily for life without concern可知正确答案是A(杀虫剂接触量的安全剂量)。 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>